Watchdog: Fix unittests

Compare get_timeout against the last timeout successfully set.
Merge most of the test cases into one. Do not rely on the tests
execution order.
Fix the watchdog_api_stub to keep timeout value set by init function.

Author: Filip Jagodzinski

UNITTESTS/drivers/Watchdog/test_watchdog.cpp

@@ -35,34 +35,16 @@ class TestWatchdog : public testing::Test {
 };
 // *INDENT-ON*
 
-TEST_F(TestWatchdog, test_watchdog_start_pass)
-{
-    EXPECT_TRUE(Watchdog::get_instance().start());
-}
-
-TEST_F(TestWatchdog, test_watchdog_start_fail)
-{
-    EXPECT_FALSE(Watchdog::get_instance().start());
-}
-
-TEST_F(TestWatchdog, test_watchdog_stop_pass)
+TEST_F(TestWatchdog, test_watchdog_start_stop_get_timeout)
 {
+    EXPECT_TRUE(Watchdog::get_instance().start(500));
+    EXPECT_FALSE(Watchdog::get_instance().start(2000));
     EXPECT_TRUE(Watchdog::get_instance().stop());
-}
-
-TEST_F(TestWatchdog, test_watchdog_stop_fail)
-{
     EXPECT_FALSE(Watchdog::get_instance().stop());
+    EXPECT_EQ(500, Watchdog::get_instance().get_timeout());
 }
 
 TEST_F(TestWatchdog, test_watchdog_get_max_timeout)
 {
     EXPECT_EQ(0xFFFFFFFF, Watchdog::get_instance().get_max_timeout());
 }
-
-
-TEST_F(TestWatchdog, test_watchdog_get_timeout)
-{
-    EXPECT_EQ(Watchdog::watchdog_timeout, Watchdog::get_instance().get_timeout());
-}
-

UNITTESTS/stubs/watchdog_api_stub.c

@@ -17,8 +17,11 @@
 
 #if DEVICE_WATCHDOG
 
+static uint32_t _timeout = 0;
+
 watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
 {
+    _timeout = config->timeout_ms;
     return WATCHDOG_STATUS_OK;
 }
 
@@ -34,10 +37,9 @@ watchdog_status_t hal_watchdog_stop(void)
 
 uint32_t hal_watchdog_get_reload_value(void)
 {
-    return (500);
+    return _timeout;
 }
 
-
 watchdog_features_t hal_watchdog_get_platform_features(void)
 {
     watchdog_features_t features;